Dual 506 - Service Manual

Service
Manual
\()
Technical data
Measured values
Current
Line
Voltage
Drive
Power
consumption
Sterling
Time
Power
Consumption
Dual
506
Edition
December 1979
typical
values. Rumble and wow and
flutter values obtained
with test record.
AC 50
or 60
Hz, changeable by changing
motor pul ley
110 — 125 V or
220 —240 V,
changeable
Dual 8 -pole
synchronous motor: precision flat
belt for flyvvheel drive
approx. 10
watts
(to
each nominal speed) approx. 2
seconds at 33 1/3 rpm
at 220
V, 50 Hz:
approx. 75 mA
at 117
V,
60 Hz: approx. 140
mA
Platter
Non-magnetic,
detachable, 1.1 kg, 304 mm
Platter speeds
33 1/3
and 45 rpm
Pitch Control Variation
at
both platter speeds.Adjustment range at 33 1/3
rpm approx. 1 semitone (6 %)
Speed control (monitoring)
with stroboscope for platter speeds 33
1/3 and 45 rpm, adjustable to 50 or 60 Hz.
Total Wow and Flutter
DIN
± 0.07 %
WRMS ± 0.04 %
Rumble
Unweighted 48 dB
(according to DIN 45 500)
Weighted
70
dB
Tonearm
Torsion-resistant tubular aluminum tonearm in
fourpoint gimbal bearing
Tonearm Bearing Friction
vertical 0.07 mN
(0.007 g)
(related to
stylus tip)
horizontal
0.15 mN
(0.015
g)
Stylus Pressure
from 0 - 30 mN (0 - 3 g) infinitely
variable with 1 mN
(0-
1.5 g)
operable from 5 mN (0.5 g) stylus pressure up
Cartridges
with
1/2
inch screw-type attachment. These can be fitted with the special accessories
no. 262
186 which c,an be obtained from trade dealers. Adjustable
overhang 5 mm.
Weight
approx. 4.1 kg
Download from www.dual.de
Not for commerical use

Summary

Technical Data

Motor and Drive

Speed Selection

Adjusting turntable speed to 33 1/3 or 45 rpm by moving the belt on motor pulley steps.

Turntable Maintenance

Instructions for removing the turntable from the bearing tube.

Drive Belt Replacement

Procedure for replacing the drive belt, noting ground side placement.

Motor Pulley Replacement

Step-by-step guide to remove and install the motor pulley, including adjustments.

Pitch Control Tuning

Feature for fine-tuning turntable pitch independently for both speeds.

Tone Arm and Bearings

Tone Arm Removal (Complete)

Detailed steps for removing the entire tone arm assembly with bearings.

Tone Arm;Spring Housing Removal

Procedure for removing the tone arm or just the spring housing.

Tone Arm Bearing Adjustment

Instructions on balancing the tone arm and adjusting bearing backlash.

Cartridge Mounting (1;2 Inch)

Anti-Skating Force Adjustment

Tone Arm Lift Operation

Lift Height Adjustment

Lift Plate Replacement

Automatic Start;Shut-off

Operational Adjustments

Segment Adjustment

Adjusting the segment for correct play and shut-off point for records.

Pawl Adjustment

Adjusting the pawl for correct clearance with the shift arm.

Power Switch Check

Ensuring the power switch disengages correctly before tone arm support.

Lubrication Guidelines

Dual 506 Specifications

General

Drive System	Belt Drive
Speed	33 1/3 and 45 RPM
Weight	5.5 kg
Platter	Non-magnetic
Wow and Flutter	0.08%
Tonearm	Ultra low mass aluminum
Dimensions	420 x 360 x 130 mm